The Spur and it's line are fun but it is seriously flawed.
Serious Problems:
Charge disintegrates if your back is to a wall.
Charge can be aimed after you release it. (Your sword swings one way but the disk can fly another way)
Charge will not work if you shield cancel immediately upon releasing
Charge slash has horribly small range
Minor Problems with sword line:
No 5 star version
Practically no knockback or flinch on the charge disk
No type damage
Shield cancelling techniques don't flow as well as other 3 strike
_______________________ Proposed solution
#Charge disintegrates if your back is to a wall.
This can be left as it is if the charge becomes viable enough
#Charge can be aimed after you release it. (Your sword swings one way but the disk can fly another way)
Make the disk fire is the direction your knight is facing before you release it. This way it is consistent with all the other sword lines
#Charge will not work if you shield cancel immediately upon releasing
Seriously just fix it, if I have a weapon that doesn't work right all the time it will spend 0 time being used.
#Charge slash has horribly small range
Increase the charge slash range to be as large as a Sealed sword first swing.
#No 5 star version
#No type damage
Create a few 5 star versions of this weapon, add some status, some damage perks vs monsters, and type damage.
#Practically no knockback or flinch on the charge disk
The disk should hit more than just 3 times especially if you have crafted it all the way up. Like the Brandish charges it should get an extra hit per level and some knockback with each hit or at least give it a massive flinch rate players can take advantage of.
#Shield cancelling techniques don't flow as well as other 3 strike blades
Shorten the time between each swing a bit. After all the swing speed of the Winmillion is comparable to that of the grand flourish but the damage is much lower, even the Daring Rigadoon deals more damage.
Grand Flourish in Stratum 2 deals 64 damage on the third swing against a neutral target
Winmillion in Stratum 2 deals 48 damage on the third swing (33 for hit 15 for sword projectile)
Either give it more speed or give it more damage.
"Charge disintegrates if your back is to a wall."
Not a serious problem. Divine Avenger has this, not that big of an issue. Valiance has this, not that big of an issue.
Also, you don't move when using the charge compared to DA and Vali, so in fact, this is even less of a problem than with DA and Vali. This is only "serious" because the charge in itself is lackluster in comparison to charges on other weapons. I myself have never encountered this issue.
"Charge can be aimed after you release it."
This is most absolutely a plus, because Spur charge is an AOE slash + aimable bullet.
"Your sword swings one way" is wrong. It swings all the ways.
"Charge will not work if you shield cancel immediately upon releasing"
Clearly you have not tried the Spur recently, they semi-patched quite a while ago, I noticed it around 12/15/2013(why did I delve into google for this...). Before it was 100% chance of no bullet, now sometimes you can shield-cancel the charge bullet, sometimes you won't.
"Charge slash has horribly small range"
Eh... yeah... but dat half block o' AOE charge slash... gotta balance this sword-gun-bomb somehow.
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"No 5 star version"
Eh? Yeah minor problem. Whatever.
"Practically no knockback or flinch on the charge disk"
Eh... this is more of a serious problem than your serious problems. Spur seems to be a knockback-oriented weapon with the way that with a full attack combo, you can push Skeletons far enough away that they can't swipe you. So the fact that the charge doesn't also push is kind of odd.
"No type damage"
Eh... Spur is kind of a joke/utility weapon to me so making it have type damage would be detrimental.. For utility, it's kind of useful to bring to any PvE situations. For the jokes, sometimes in LD some depr striker will run into me and get hit by the charge slash :3 It's like a vastly inferior FoV in LD, except you can more accurately hit Strikers who bob and weave (with aiming the charge bullet).
"Fix the Spur line Charge attack" ... "Shield canceling techniques don't flow as well as other 3 strike blades"
._. don't just randomly add stuff about shield-canceling techniques when you're talking about the charge. pls
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How doez you propoze to fix ze charge attack if it'z zo flawed?
Time to go depr in LD.